First of all, no, absolutely no article I've read portray a picture that is even a bit similar to what thunderf00t claimed in that video (especially with regards to bandwidth). It is such a weird argument to fall back on "well ground stations are still needed", as if that was his original claim. The laser interconnects work, and his arguments about alignement/bandwidth/cost were just wrong.

And yes. Even chatgpt says that it is used to prevent vibrations. It could also help cooling the launch pad I guess. But not the engines! That's a completely different thing, the engines get absolutely 0 cooling from the water. The entire point is to allow them to get as hot and powerful as possible without damaging everything around! It's almost entirely for vibration control btw, so any cooling to the launchpad isn't the point. You don't even need chatgpt to know that, it's literally something that a lot of launch platforms have done for decades.

As for frauds, how exactly is SpaceX a fraud? Again, I don't care about musk. I'm specifically talking about SpaceX. And in any case, there is so much legitimate reasons to dislike Musk that it is actually super unhelpful to have personalities like thunderf00t obsessing on something as visibly successful as spacex.